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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c83b0126b5ba6fe403e32a3c6dbb30b921baedb61351b087a0951e263d44f8a' 
  AND token = '+dLTSt+kpOoil3cWD1CbsbEN7pKG28YkM4Q4QilUOEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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