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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e614da26d42728a57e14b35c20223a4ee347b44910032bb5ef6f1760c0e52b3' 
  AND token = 'bMbe4EOH8BpOp6g7MlsBRGV56I1zmj5p5AhmuqYaHJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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