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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5952de3cbb1702da028d3432799239053ca872172da9b585efe26bf81164b9d3' 
  AND token = 'huTlVnFDxptQUA+Wf0wv2xySCTuyP9soWkWDFhSeQ2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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