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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b98b0089fb9af82e4e85c92fd67bcac9b2439cd490196d1ba90c1f40babaf67' 
  AND token = 'e/u2Jz6PqG/PZrCnRHLBu7yN02L6Ng6B8j+dQvPyvWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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