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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d615e8b1466104ce46359f92ffbd415e3f3a438168a79df6f2bbbe4bbc787ae' 
  AND token = 'ZU4T4WNp6RyXzfsnlJD8eLNRGGhXQ5sLgCW5kxx3/So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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