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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb74525de991969171eb18ac4800528d94039f602c1ecf9af56e58671da25f3' 
  AND token = 'uxNpUtlV8sU0gtL9wHwN/dz1TFSB9P3Bxmy52cxHw0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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