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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a488115e1eb73bf785a9f29b112f3a258a4f0e6c2d487366f6f22f47bfdf87c5' 
  AND token = '7V2aVJMMRSnfDkel9BOeL/wMS8lld+oNBOISHDy+d2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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