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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1449717687a1d662ca676325a1a1fc13b1349f1922e043014fdbe5f89f1df70b' 
  AND token = 'Xx3amHKjkhPRayzELv87dEYOFELNYF0VYRTuu2Q8Jnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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