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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc225b354814fceb092cfc96d4e4e65c008d2e1c50041e7e729229617f17f1a' 
  AND token = '9UsAad8p21aUU2K4RFtliqwNW/Htg+BxAyW5gg5vMz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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