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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe50c061ad3e459027c4ddabc817105a808f6ac4834cae3a847aa3cfc5206a2' 
  AND token = '8Rnxj63PzTq7212WXpbLa0ujSGq9vQEuQzW/IHEL8r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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