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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a49e172788b7ba5653aac2c547ecb6354cc8f09e8a1a0fea2b2b40afea3a6c' 
  AND token = 'bVDCnXJNkcQsvArAqTpC6Yu0gfhDiaqJEEqhPThYlFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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