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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20a455d425bd16d3591bf7be96ac812cf5e1c68b8a1d814339b4d8170a5d307' 
  AND token = '/4Kp0mwkUa80Kkk8zNxq9lymq5SFTlt1trasgRh0Z3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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