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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adcaeed87a6cf098d081398739f0f26ac8208aec62a111f6642b7c8b3e16dc5' 
  AND token = 'BoUQVj/vqRtrOjAQL8r7Gn1JT1q2BqalVYTv56TX6Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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