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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b55e277c07023f5e2d9526aff8df2bc22ccb1de7266efabfff3370d411f692' 
  AND token = 'O7haxgCZ6oQaRMf4kdLLb6FXsYk+GwjlNr62ybHFHk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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