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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6715918becdd6ef9e593792c03cd5bef8a5a342a21fe1fea77bef3d54ccb150c' 
  AND token = 'a5grgoSTOMN4LlYsXpmcylH3eCkp/vHo/+IJSE6LBm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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