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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1292738c100a9f76038de2409287c39801a2617c12edd5b421b4ac02c3f40769' 
  AND token = 'AOzMN8+oRPhbsrw9105xRM4JBvgfJeiImeAYEfweY/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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