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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229302260e9f5e6ae4faac79f5a81433bee443b16a50560f6946e752153fb877' 
  AND token = '4jcgBb3PCEnDNFTHGrig3722cnAC3wp4jhJSHvWUX/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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