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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517071f811f463ef9e723be39b9e2882d70e5734b56b42dd9f5bb1a14e718070' 
  AND token = 'FH7MKjpNythLwlAWiNZDeFkSUlnBb9F5g4wMm+dId1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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