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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef8cf5fdeab765d9a8f39574da6b879f8236ea5ca9b47a15761547c0449b9be' 
  AND token = 'i6dkawxSdwB9Q8GErHeENahANhHIwVea4J0Y+8q5cDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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