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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb4b26c8d8b7536bb938be911e194ae289a0ad9342f95c6837f1eefcdceb4e2' 
  AND token = 'KjA7XDs4ub5O6/o7moHFS+lB6CLQflP93v9IYUKc3SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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