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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d3df07a1aa193b1e4adddd43165924d3af6f422a0f05c8d5cde0117557e8fd' 
  AND token = 'v2P3NT75PFjvHpSVfmSirfaLn4A24reWqbhASwnEoJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}