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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c23b60805b26ef5fc74981a255568a15c21780536dfd0a4261b817bfd5abf98' 
  AND token = 'sYlRxBOvfTsp3CILBOQBcbI+P49316uFKF84UH1vZRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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