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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdc6db4306a4ef1615ba41d6dc664b0eb675d3accd9fcc5406eba2ffba04765' 
  AND token = 'tq4m7itiRglrLBcFGlkAHEWvjUq2NZ6mG7cDuQV3ieo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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