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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57881cc0258e3f653626f2ca76d1c83067ddb0151162c9ad62c49a1475805f18' 
  AND token = 'hsVzhurJ0raTbxyJ35QHS1vNDJWgNcyZsyJxPHvFGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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