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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515d196aa1338e996e62341b66e166e5d8d6dd946edbdc2c4cb2116e65308ed1' 
  AND token = 'PbsN7zmhr09i9fKboc4tSVsynziJ/RQ+v8m0PSOsCbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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