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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9519ce462f0ef4893e5cef7776e6a31ab8341ebc1e05ebe7a7370c392f4aff' 
  AND token = '0lCxXiM0dV85229lCkm9ariTEWDijf+8m/mF+gKEsbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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