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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191b43ee7a60c0b6af1ac3e60481fdb5d5324dbc42d05cdb5589e37d8ce84600' 
  AND token = 'Ys+6Z43/yD4/aP2YuWfaT46jABHTvsa/915pXrzPUww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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