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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dce3dd331a1c93e017d38bfa70c87aece51ac3d138282d9e1c05261b840693c' 
  AND token = 'RB2MXjjfu40fvI6gXEKbvnXtsGfZ3ZAOwhoNtGkKpS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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