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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdda9cad15785a0f8e8ba4055bcfe4471591fe900c1d77b4f6fe51c2524f46c' 
  AND token = 'Hgvxajg3i2iMKCkREve3wYatukzVZSxxRy+mhzILT3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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