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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc7ebad54854f95085e08034bc799f74701dd14a64e39d9202f9dc8d39f2496' 
  AND token = 'ffoZJmkV5EKJeILXqaTqcUkHvG79rtX6h5M9WUJWpNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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