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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750caa95a6c40cbbd933abcaae3fa25a54c60b78ada4182def4c719c38367721' 
  AND token = 'ijRpNI2KOoLHbaMb9M+EC9sXYa/Zsz8xVC1U+Thve54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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