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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e36c8e3a68db1eddc3b3658cb5be7230eda7421d03a5717c878fe45681fa8e' 
  AND token = 'CJCTDBw6rsqibwmwghYeCr0Va1N76kydqEEuA1cn3Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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