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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8d0a60917a8540b1f7f27eea952d304afec9553fff32eba2ceb1c7d68c0947' 
  AND token = 'FH/cPLVARtc9rbVhvIqaPQEGM4DZ2iAWA9BinsEVF28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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