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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fd983fdea40d92b1939dce3247b5c355afd0e08688b8e9cbc64a998159e18e' 
  AND token = 'Y+oPA6+aAo2hSA04WfiXU/GnebvR1jk+AJAJdu1u4DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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