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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bc9b467a3a75e81aa0a47c9340546c8f68638308e818da38d9a94a7156c3f5' 
  AND token = 'n4QzOtIKUnJNSzIm8GXnkwhFGraJ+H/5pMcwU29GJfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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