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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b2960affedc4e6e62a524a27c788c17aeb08ca0fcd6c17b17b599562c69091' 
  AND token = 'H7jJvZsmu/jvPjntZJvjQ/SsB/jg8o7dT7H8pCe5dLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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