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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd11b1f67e6d620f89470e4608f30f597b3385bf6847c7fcf1ddf3f810f5af2' 
  AND token = 'KM68WyYwL9ZSLafQF4H/xk2o4cRosYvvdDjyyXUg/KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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