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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33e82fbfad061d98897d3a8b6f3a5d8d4eca65fa3751529a272ef180e6ab2a8' 
  AND token = 'ViV+iz6f2UaOf48lvVYgZ0NWvCFK7oqYUoR/DMlUU80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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