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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101ed7142243d274a1a86599ae2eaaacff177f797c02d5b305a81a565c44e040' 
  AND token = 'RgAwDkiT7s6G+t2fecoS0/5P4ZAQPngweET69v7vXV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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