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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09094848a1ddb41acb4d36dae869ed0058fc5cbac9bdf1f05de81554378e397' 
  AND token = 'EQDaT1GRGItBBr7D8/uJAXF2caaFWYfSNiTLV0fY/k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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