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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69dc0873ded28867b542ca0cbbc8467c50437bbce8cbb87f0c4f9e361274bf7' 
  AND token = 'pFT6K+feAvQYu9TbdFD8XbweYr/FwPvG+GBaLWz8PBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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