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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0942a59ddb5ab2afcf017d9ad2a92a55edc726801b7f56c945c6b60b9558c23' 
  AND token = 'ow7XcZsS4eDxu751fPu/Cs0JWbwQb7UVsND8mfRh6NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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