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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55430bfff20548a3a3a126bc91d30062c6ab8e70b6262d254f911b98c291e9d7' 
  AND token = 'phfS75UgPw/X7FBYP/0EV7X57BXP9Mh25BlmpX0Frsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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