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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae252a6f12aedae8fcd8a10afc51a72b3879b2238539a3d0e93755cfb7f8541' 
  AND token = 'hMu4gHkxhbVAhGjZWReD0wtlgBUlT0oQ7KobN9JA6lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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