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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f9ae6b74953d0ca4b9d19de4b1a76e2ca2cc85fca2a8808474afd0109ff2dc' 
  AND token = 'oiWJRrBvfpqSbGEL87JOdRJ5yf2OGITvhSR7EufdIe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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