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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea8f16d2839fae5ee219d4efa095ab11270c07e7d6f77a747b8a5c7bf26a8f0' 
  AND token = 'Oj5q9oP3QxfpjyCmATKJva/940/RtnVDF6GbjyB7/c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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