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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d33e1e86c164c9d239e3ae6c95fe393b0d8521306af6fbaf56d554d893a78de' 
  AND token = '6LpegMZ4jW6a4t1RveUFZRbT1XEdHEJliYyAgUK6aPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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